JSFiddle - React, Tailwind, and code Playground

HTML

<select id="myselect">
  <option value="Model 1">Model 1</option>
  <option value="Model 2">Model 2</option>
</select>

<div id="Form1" class="forms">Form 1 Contents</div>
<div id="Form2" class="forms">Form 2 Contents</div>

JavaScript

$(function() {
    $(".forms").hide();
    $("#myselect").change(function() {
        switch($(this).val()){ 
            case "Model 1":
                $(".forms").hide().parent().find("#Form1").show();
                break;
            case "Model 2":
                $(".forms").hide().parent().find("#Form2").show();
                break;
        }
    });
});